Thermosetting powder coating composition of a blend of acrylic polymers having different glass transition temperatures and a blocked polyisocyanate cross-linking agent
AssigneeE. I. Du Pont de Nemours and Company
InventorPaul H. Pettit, Jr.
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Abstract
A thermosetting polymer powder coating composition comprising finely divided powder particles that have a diameter of about 1-100 microns wherein the powder particles are a blend of A. a hard acrylic polymer having a high glass transition temperature; B. a soft acrylic polymer having a low glass transition temperature; C. a blocked organic polyisocyanate; D. a hydroxy functional plasticizer; and E. catalytic amount of an organometallic compound; The thermosetting powder coating composition is particularly useful as an exterior finish for automobile and truck bodies.
Claims12
A thermosetting polymer powder coating composition comprising finely divided particles having a particle size of 1-100 microns;
- wherein the particles consist essentially of an intimately mixed blend of
- A. 20-70% by weight of a hard acrylic polymer consisting essentially of
- 1. 80-95% by weight, based on the weight of the acrylic polymer, of methyl methacrylate, styrene or a mixture of a methyl methacrylate and styrene,
- 2.
Dependencies are inferred from the claim text.